Auflistung nach Schlagwort "631 - Technologie, Ausrüstung, Materialien"

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  • Vorschaubild
    Publikation
    Android Best Practices to Improve Battery Efficiency
    (12/2014) Yereaztian, Chris; Luthiger, Jürg
    Multi-core CPUs, motion sensors and multiple wireless radios all draw a significant amount of power which make a regular battery recharge a necessity. Applications, which extensively use the available hardware, reduce the battery runtime severely. Continuous motion sensor recording excessively stress a smartphone’s CPU preventing it from entering a deep sleep state. Android 4.4 introduces a new batchmode for sensors data to keep the CPU asleep for longer periods of time by delaying the reporting of new data from the sensors. The same technique is applied when writing to flash memory. When using a content provider to store data write amplification occurs, which affects writing performance negatively. The longer write times due to the reduced writing speed decrease the battery efficiency even more. A similar batch-oriented strategy reduces the occurrence of write amplification. In return, the reduced writing time improves the battery efficiency.
    01B - Beitrag in Magazin oder Zeitung
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    Publikation
    06 - Präsentation
  • Vorschaubild
    Publikation
    aWall: Agile Collaboration using Large Digital Multi-Touch Cardwalls
    (12/2016) Anslow, Craig; Burkhard, Roger; Kropp, Martin; Mateescu, Magdalena; Vischi, Dario; Zahn, Carmen
    Despite the availability of many digital agile board tools, most co-located agile software teams still use physical cardboards for their daily standup meetings. This is due to the fact that existing digital agile boards lacks supporting a collaborative workspace, direct interaction for the whole team in meetings, or making project information directly visible. In this paper we present aWall, a digital agile cardwall designed for the highly collaborative agile work style using large multi-touch wall displays. The effectiveness of aWall was evaluated in a user study with eleven software practitioners. Our findings indicate that aWall enables and encourages team work due to the large size of the wall, accessibility and visibility of large amounts of information, and possibility of customization of the interface. Based on this work, we suggest that augmenting digital cardwalls with large interactive touch technology and new interaction concepts is a useful way to support effective collaborative agile software development processes.
    01B - Beitrag in Magazin oder Zeitung
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    Publikation
    Combining Process Modelling and Case Modeling
    (2014) Hinkelmann, Knut; Pierfranceschi, Arianna
    Adaptive Case Management deals with processes that are not predefined or repeatable, but depend on evolving circumstances and decisions regarding a particular situation. While case management is often considered as different from conventional business process management, in reality they cannot be strictly separated. A structured business process can contain parts which deal with non-routine cases. The Object Management Group (OMG) published the Business Process Model & Notation (BPMN) as well as the Case Management Model & Notation (CMMN). There is an ongoing debate whether these two languages should be combined are kept independent. After a short introduction into CMMN and BPMN we analyse an application process as it is typical for public administration in order to identify strengths and weaknesses of both BPMN and CMMN. We show that typical processes contain both structured and non-structured parts and neither BPMN nor CMMN alone is adequate to model the process. Finally, we propose recommendations for a metamodel, which combines elements of BPMN and CMMN.
    04B - Beitrag Konferenzschrift
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    Publikation
    Eine Kategorisierung mobiler Applikationen
    (12/2012) Hildebrandt, Andreas; Luthiger, Jürg; Stamm, Christoph; Yereaztian, Chris
    Mobile Applikationen lassen sich auf verschiedene Arten entwickeln. Je nachdem welche Anforderungen an eine Applikation gestellt werden, sollte zwischen einer nativen Umsetzung, einer Webapplikation oder einer Mischung aus beidem gewählt werden. Die Wahl der am besten passenden dieser drei Kategorien ist nicht immer einfach und sollte im Vorfeld genau abgeklärt werden. In diesem Artikel zeigen wir die Eigenheiten dieser drei Kategorien auf und vergleichen sie miteinander anhand von Beispielen und einer fiktiven Ticketing-Applikation.
    01B - Beitrag in Magazin oder Zeitung
  • Vorschaubild
    Publikation
    Electrical vehicle batteries in energy storage systems: an economic analysis for Swiss residentials
    (09/2015) Menn, Claudio; Geissler, Achim
    Battery energy storage (BES) systems for residential buildings can contribute to power grid stability. The demand for decentralized storage capacity in Switzerland is expected to rise due to political decisions that facilitate renewable energies with power fluctuations such as photovoltaics (PV). Using lithium based BES to meet this demand could have a significant environmental impact as a result of energy intensive production-processes. Furthermore, currently available conventional BES (C-BES) systems are not eco-nomically viable. Within this context, a second use of electric vehicle batteries for 2nd-life-BES (2nd-BES) can be an environmentally sound alternative that facilitates grid integration of residential PV-systems. A model describing the economic viability of 2nd-BES based on the Net Present Value (NPV) method is presented. On the basis of one example building each, results are given for single-family-houses (SFH) and multi-family-houses (MFH), focusing particularly on the market situation found in Switzerland. Results show a cost advantage for 2nd-BES in MFH compared to C-BES systems if a Cycle Life (CL) of 800 and more is available. In SFH, a 2nd-BES shows only a slightly better economic performance than a C-BES system if a CL of 4800 and more can be guaranteed. Notwithstanding the relatively low Levelized Cost of Electricity (LCOE), the NPV for both 2nd-BES and C-BES in both SFH and MFH is negative. Reasons for this are high initial system costs and an electricity tariff scheme with low incentives for con-sumers to store electricity. In this paper, only the current tariff structure in Switzerland is considered. However, alternative tariff schemes, e.g. real time pricing for residential consumers, have become reality in some countries. The impact of such tariff schemes on the economic performance of 2nd-BES is left to future research.
    04B - Beitrag Konferenzschrift
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    Publikation
    Energieflüsse eines Mehrfamilienhauses unter der Lupe
    (AZ Medien AG, 12.10.2012) Dorusch, Falk; Hall, Monika; Dott, Ralf
    Ein detailliertes Monitoring der Energieflüsse ermöglicht Einblicke in die Energiebilanz eines Mehrfamilienhauses mit Elektromobilität in Rupperswil. Dank eines 15-minütigen Messwerterfassungsintervalls können Aussagen zur Gleichzeitigkeit von solarer Energieerzeugung und Stromverbrauch getroffen und Potenziale zur Lastverschiebung aufgezeigt werden.
    01B - Beitrag in Magazin oder Zeitung
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    Publikation
    Equivalence Testing Mobile Apps
    (12/2012) Denzler, Christoph; Kröni, Daniel; Moschko, Maxim
    Mobile apps are often developed and then evolved on more than one mobile operating system. For the publisher of such apps, the problem is how to ensure equivalence of the product on the various platforms, in the sense of acting equivalently with respect to a test set. In this paper we present an approach that tackles this problem from two directions: architecture and testing. First we will explain the role and pitfalls of reference architectures. Then we will present our equivalence testing framework. It is based on mocking components of the target implementation. Instead of implementing mock components for all platforms, our approach is to implement these mocks only once and run them on a central server. On the tested target device, stub components are injected that forward to their server-based counterparts. Thus the exactly same test code is applied to all platform specific implementations.
    01B - Beitrag in Magazin oder Zeitung
  • Vorschaubild
    Publikation
    Fensterlüfter in Wohngebäuden (Sanierung und Neubau) - Die Sichtweise der Nutzer
    (Brenet, 07.09.2018) Hoffmann, Caroline; Primas, Alexander; Geissler, Achim; Huber, Heinrich
    In diesem Paper geht es um passive Fensterlüfter (ohne Ventilator) im Zusammenhang mit einer Abluftanalge in bereits errichteten Gebäuden. Die Veröffentlichung konzentriert sich auf die Auswertung von Gebäudebegehungen und Nutzerbefragungen (280 Nutzer in 28 Gebäuden).
    04B - Beitrag Konferenzschrift
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    Publikation
    Fremdstoffe in biogenen Abfällen
    (Hochschule für Technik FHNW, 24.06.2024) Moser, Lukas; Tschan, Robin; Temperli, Hansjörg; Leber, Michelle; Mandaliev, Petar; Annelies Uebersax, Biomasse Suisse
    Ziel dieser Projektarbeit ist die Hypothese zu prüfen, ob die Verwendung von Compobags einen signifikanten Einfluss auf die Menge und Art der Fremdstoffe hat, sowie eine Aussage zur Qualität des gesammelten Grünguts zu treffen. Der Vergleich zwischen Gemeinden, die Compobags erlauben, und solchen, die sie verbieten, zeigt keine signifikanten Unterschiede. Die erhobenen Daten dieser Projektarbeit weisen keinen Zusammenhang zwischen der Verwendung von Compobags und der Menge von artfremdem Abfall im Grüngut auf. Grundlage dieser Erkenntnisse sind, die von Hand durchsuchten, biogenen Abfälle. Auffällig war, dass in den gesamten 40.4 Tonnen biogenen Abfalls nur zwei Compobags gefunden wurden, die artfremden Abfall enthielten. Dies deutet darauf hin, dass Compobags nicht zur Entsorgung von artfremdem Abfall missbraucht werden. Umgekehrt kann auch nicht festgestellt werden, dass nicht abbaubare Plastiksäcke verwendet werden, um Grüngutabfall zu entsorgen. Ob die verwendeten Plastiksäcke absichtlich, versehentlich oder aus Unwissenheit verwendet wurden, kann dabei nicht gesagt werden. Die biogenen Abfälle wurden auch fotografiert. Ein direkter Vergleich zwischen der Handsortierung und den Fotos kann nicht erstellt werden, weil die Fotos nur eine unbekannte Teilmenge der Handsortierung abbilden. Dennoch ermöglichen die Fotos Rückschlüsse auf die Herkunft des artfremden Abfalls. Es zeigte sich, dass nur wenige, aber stark verschmutzte, Container den Grossteil des artfremden Abfalls und die daraus resultierende Kontaminationsrate ausmachten. Somit hängt ein Grossteil der Verschmutzung nicht mit der Verwendung von Compobags zusammen, sondern ist auf andere Einflussfaktoren zurückzuführen. Die Fotos bestätigten auch die zuvor erstellten Prognosekarten. In Quartieren, für die ein erhöhtes Risiko für artfremden Abfall prognostiziert wurde, wurde tatsächlich ein höherer Anteil an artfremdem Abfall gefunden.
    11 - Studentische Arbeit
  • Logo des Projekt
  • Vorschaubild
    Publikation
    Man-in-the-Middle: Analyse des Datenverkehrs bei NFC-Zahlungen
    (12/2014) Arnosti, Christof; Gruntz, Dominik
    Das Bezahlen mit kontaktlosen Kreditkarten liegt im Trend, insbesondere seit grosse Ladenketten wie Migros, Coop oder Valora diese Bezahlmöglichkeit unterstützen. Mit Google Wallet, Apple Pay und Tapit von Swisscom besteht vermehrt auch die Möglichkeit mittels Smartphone kontaktlose Zahlungen auszulösen. Wir haben die Daten, die zwischen einem Terminal und einer Karte bzw. einem Mobiltelefon ausgetauscht werden, bei einer echten Bezahlung aufgezeichnet. In diesem Artikel beschreiben wir dieses Protokoll und die Software, die nötig ist, um solche Daten aufzuzeichnen.
    01B - Beitrag in Magazin oder Zeitung
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  • Vorschaubild
    Publikation
    Qualitative Study of Successful Agile Software Development Projects
    (12/2014) Kropp, Martin; Meier, Andreas
    Various studies show that the agile method has become a mainstream methodology for software development. When agile pioneers introduced this approach, they executed very successful projects which lead to the enormous popularity of agile development. With becoming mainstream, less experienced teams started to apply the agile approaches and news about failed agile projects appeared. This raises the question, what it needs to conduct successful agile projects. In a qualitative study we asked IT companies about the essential success factors in their successful agile projects. We found that there was a strong focus on engineering and management best practices. We found that when these practices did not work, mature teams sensed that following a recipe is not sufficient, and they started adapting the agile process to their needs. Applying a sense-making methodology like the Cynefin framework, theoretically explains our observations in the study.
    01B - Beitrag in Magazin oder Zeitung
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    Publikation
    Secure Physical Access with NFC-enabled Smartphones
    (12/2015) Arnosti, Christof; Gruntz, Dominik; Hauri, Marco
    This paper presents a smartphone-based physical access control system in which the access points are not directly connected to a central authorization server. The access points ask the mobile phone whether a particular user has access or not. The mobile phone then relays such a request to the access server. The authentication of the smartphone is based on public-key cryptography. This requires that the private key is stored in a secure element or in a trusted execution environment to prevent identity theft. In our solution we use the following secure element archiectures: Host Card Emulation (HCE) and a microSD-based secure element. We show that the HCE approach cannot solve the relay attack under conservative security assumptions and we present and discuss an implementation based on a microSD secure element that still allows the access points to connect to the authorization server upon every access albeit the access points are not connected with it.
    01B - Beitrag in Magazin oder Zeitung
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    Publikation
    06 - Präsentation
  • Vorschaubild
    Publikation
    Towards a better understanding of solid dispersions in aqueous environment by a fluorescence quenching approach
    (Elsevier, 25.10.2018) Jankovic, Sandra; Kuentz, Martin; Aleandri, Simone
    Solid dispersions (SDs) represent an important formulation technique to achieve supersaturation in gastro-intestinal fluids and to enhance absorption of poorly water-soluble drugs. Extensive research was leading to a rather good understanding of SDs in the dry state, whereas the complex interactions in aqueous medium are still challenging to analyze. This paper introduces a fluorescence quenching approach together with size-exclusion chromatography to study drug and polymer interactions that emerge from SDs release testing in aqueous colloidal phase. Celecoxib was used as a model drug as it is poorly water-soluble and also exhibits native fluorescence so that quenching experiments were enabled. Different pharmaceutical polymers were evaluated by the (modified) Stern-Volmer model, which was complemented by further bulk analytics. Drug accessibility by the quencher and its affinity to celecoxib were studied in physical mixtures as well as with in SDs. The obtained differences enabled important molecular insights into the different formulations. Knowledge of relevant drug-polymer interactions and the amount of drug embedded into polymer aggregates in the aqueous phase is of high relevance for understanding of SD performance. The novel fluorescence quenching approach is highly promising for future research and it can provide guidance in early formulation development.
    01A - Beitrag in wissenschaftlicher Zeitschrift
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